Display screen or portion thereof with a graphical user interface



The FIGURE is a front view of a display screen or portion thereof with agraphical user interface.

The ornamental design which is claimed is shown in solid lines in thedrawings. The outer perimeter broken line showing the display screen andall other broken lines showing text and figures are included for thepurpose of illustrating portions of the article and form no part of theclaimed design.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface, as shown and described.